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/********************* */
/*! \file var_match_generator.cpp
** \verbatim
** Top contributors (to current version):
** Andrew Reynolds
** This file is part of the CVC4 project.
** Copyright (c) 2009-2021 by the authors listed in the file AUTHORS
** in the top-level source directory and their institutional affiliations.
** All rights reserved. See the file COPYING in the top-level source
** directory for licensing information.\endverbatim
**
** \brief Implementation of variable match generator class
**/
#include "theory/quantifiers/ematching/var_match_generator.h"
#include "theory/quantifiers/term_util.h"
#include "theory/rewriter.h"
using namespace CVC4::kind;
namespace CVC4 {
namespace theory {
namespace quantifiers {
namespace inst {
VarMatchGeneratorTermSubs::VarMatchGeneratorTermSubs(Trigger* tparent,
Node var,
Node subs)
: InstMatchGenerator(tparent, Node::null()),
d_var(var),
d_subs(subs),
d_rm_prev(false)
{
d_children_types.push_back(d_var.getAttribute(InstVarNumAttribute()));
d_var_type = d_var.getType();
}
bool VarMatchGeneratorTermSubs::reset(Node eqc)
{
d_eq_class = eqc;
return true;
}
int VarMatchGeneratorTermSubs::getNextMatch(Node q, InstMatch& m)
{
int ret_val = -1;
if (!d_eq_class.isNull())
{
Trace("var-trigger-matching") << "Matching " << d_eq_class << " against "
<< d_var << " in " << d_subs << std::endl;
TNode tvar = d_var;
Node s = d_subs.substitute(tvar, d_eq_class);
s = Rewriter::rewrite(s);
Trace("var-trigger-matching")
<< "...got " << s << ", " << s.getKind() << std::endl;
d_eq_class = Node::null();
// if( s.getType().isSubtypeOf( d_var_type ) ){
d_rm_prev = m.get(d_children_types[0]).isNull();
if (!m.set(d_qstate, d_children_types[0], s))
{
return -1;
}
else
{
ret_val = continueNextMatch(
q, m, InferenceId::QUANTIFIERS_INST_E_MATCHING_VAR_GEN);
if (ret_val > 0)
{
return ret_val;
}
}
}
if (d_rm_prev)
{
m.d_vals[d_children_types[0]] = Node::null();
d_rm_prev = false;
}
return -1;
}
} // namespace inst
} // namespace quantifiers
} // namespace theory
} // namespace CVC4
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